Question

ulie is at the store buying groceries. She needs to get a quart of orange juice and some peaches. The quart of orange juice costs $2.25, and the peaches are $0.75 each. The function f(x) = 0.75x + 2.25 represents Julie's expenses at the grocery store. What do the f(x) and the x represent?

f(x) represents the number of items purchased at the grocery store; x represents the number of peaches purchased.
f(x) represents the total cost of the grocery bill; x represents the cost per peach.
f(x) represents the number of items purchased at the grocery store; x represents the cost per peach.
f(x) represents the total cost of the groceries; x represents the number of peaches purchased.

Answer 1

thoughts?

let's think about what x might represent. based on the answer choices, it is either the number of peaches, or the cost per peach.

in general, the cost of (a) items that cost (b) each, the total amount paid is a*b (or b*a, since multiplication is commutative)

based on this, 0.75x represents the total cost of the peaches. if $0.75 is the price per peach, what do you think x represents?

now, once you understand what x represents, consider what f(x) = 0.75x + 2.25 means, given that one quart of orange juice is $2.25